青铜人像失蜡铸造

本文从理论和实践两个方面探讨了大型、复杂铸件的失蜡铸造工艺,成功地将水玻璃砂芯用于失蜡铸造,这对复杂艺术品的精密铸造有意义,     

微波硬化对水玻璃砂性能的影响

采用微波加热技术硬化水玻璃砂，系统测试并分析了水玻璃加入量、微波加热时间和加热功率对砂芯强度的影响规律。结果表明，在本实验条件下，水玻璃加入量和微波加热功率对砂芯峰值强度出现时间没有影响，峰值强度均出现在10min左右。加热时间超过20min以后，砂芯强度基本保持不变。     

化学灌浆在地基基础工程中的应用综述

该文比较全面的叙述了化学灌浆技术在国内外处理地基方面的研究与应用现状,以及存在的问题。同时介绍了化学灌浆的具体内容及其在典型工程上的应用情况。     

牙科用硫酸钙球形颗粒制备工艺研究

为满足牙槽骨缺损修复对填充颗粒材料性能的要求,基于搅拌造球法,将α-半水硫酸钙粉末制备成硫酸钙球形颗粒.在实验室条件下考察了半水硫酸钙粉末添加量,造球时间以及水玻璃粘接剂浓度对球形颗粒性能的影响,并为制备牙科用硫酸钙球形颗粒提供了基本数据.结果表明,随着粉末加料量增加球形颗粒粒径也相应增大;在一定范围内,延长造球时间会提高球形颗粒抗压强度;随着水玻璃浓度提高球形颗粒形态变差,造球得率下降以及抗压强度升高.     

水玻璃砂的发展

越恶霸虎严格的环保法规要求,必将给污染最少的水玻璃砂带来大发展的机遇,水玻璃砂理论和技术的进步,使得CO2法的水玻璃加入量有可能降低到2.5%-3.0%,有机酯法为2.0%-2.5%,微波法为0.5%-0.8%,再加上水玻璃旧砂化学再生法的发明,在不久几年内,水玻璃砂的溃散性和旧砂回用将接近或达到树脂砂的水平,水玻璃砂第三次大发展的条件日趋成熟。     

Bricks made of coal fly-ash and slag, cured in the open air

Volume mass, compressive strength, water uptake and water absorption of pressed test samples made of a mixture of coal fly-ash, slag and sodium silicate solution (water-glass) were determined. It was found that such mixtures can solidify in the open air and form water-stable materials. The composition and structure of new formations for the binder and cured material itself were established using X-ray diffraction and a scanning electron microscope. The material has a high water uptake, which may be reduced using a number of different methods, the best of which is short-term impregnation with a hydrophobic material of the siloxane group. The water uptake and water absorption of compressed samples impregnated with such materials are similar to those of comparable building materials, such as lime-sand bricks, clay bricks or concrete blocks.     

水玻璃炉的PLC控制

利用可编程序控制器控制水玻璃炉自动换向。保证了水玻璃炉安全可靠地运行，同时降低了能耗。     

甲苯二异氰酸酯和泡花碱交联聚乙烯醇类建筑胶水的研究

本文采用正交实验法,探讨在水基中甲苯二异氰酸酯(TDI)和泡花碱共同对聚乙烯醇(PVA)进行交联改性,形成一种新型环保建筑胶水。从反应原理和反应后体系中残存TDI游离的量来证明该建筑胶水的环保性。同时还探讨TDI和泡花碱的加入量、以及交联反应的温度等因素对该建筑胶水的180°剥离强度和耐水性能的影响。     

水玻璃的调制与模数的快速测定

介绍了水玻璃的调制方法,提出了一种快速测定水玻璃模数的方法。     

Inlfuence of wet activation of used inorganic binder on cyclically refreshed water glass moulding sands hardened by microwaves

The paper presents the research results of using an innovative method to reclaim the waste moulding sands containing water glass. Two of the examined processes are connected with “dry” or “wet” activation of inorganic binder in waste moulding sand mixtures physicaly hardened by microwave radiation. The sand mixtures consisting of high-silica sand and water-glass with average molar module 2.5, were subjected to the folowing cyclical process: mixing the components, compacting, microwave heating, cooling-down, thermaly loading the mould to 800 °C, cooling-down to ambient temperature, and knocking-out. After being knocked-out, the waste moulding sands were subjected to either dry or wet activation of the binder. To activate thermaly treated inorganic binder, each of the examined processes employed the surface phenomenon usualy associated to mechanical reclamation. The study also covered possible use of some elements of wet reclamation to rehydrate waste binder. To evaluate the effectiveness of the two proposed methods of waste binder activation, selected strength and technological parameters were measured. After each subsequent processing cycle, the permeability, tensile strength and bending strength were determined. In addition, the surface of activated sand grains was examined with a scanning electron microscope. Analysis of the results indicates that it is possible to re-activate the used binder such as sodium silicate, and to stabilize the strength parameters in both activation processes. Permeability of the refreshed moulding sands strongly depends on the surface condition of high-silica grains. The wet activation process by wetting and buffering knocked-out moulding sands in closed humid environment makes it possible to reduce the content of refreshing additive in water-glass. The moulding sands cyclicaly prepared in both processes do not require the addition of fresh high-silica sand. The relatively high quality achieved in the refreshed moulding sands alows them to be reused for manufacture of next moulds. Thus, the two proposed methods for cyclicaly processing used moulding sands containing sodium silicate, subject to microwave hardening, are suitable for economic and ecological circulation moulding mixtures.